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On May 4, 2011, Themmen appeared on the ITV Breakfast programme, Daybreak, alongside the other child actors from Willy Wonka & the Chocolate Factory: Peter Ostrum (Charlie Bucket), Julie Dawn Cole (Veruca Salt), Denise Nickerson (Violet Beauregarde) and Michael Bollner (Augustus Gloop).
He also appeared in many films, including Willy Wonka & the Chocolate Factory (1971), in which he played the minor role of a "tinker" who spoke to Charlie Bucket (Peter Ostrum) at the gates of Willy Wonka's chocolate factory.
He is the father of actor Freddie Highmore, who played Charlie Bucket in the 2005 film version of Charlie and the Chocolate Factory.